header {
  width: 100%;
  height: 0.5rem;
  background-color: #1d6dff;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 0.1rem;
}
header .back {
  text-align: center;
  line-height: 0.5rem;
}
header .back a {
  height: 0.4rem;
  width: 0.4rem;
  font-size: 0.2rem;
  color: #fff;
}
header h1 {
  font-size: 0.2rem;
  font-weight: 900;
  color: #fff;
}
header .app a {
  display: block;
}
header .app a img {
  height: 0.34rem;
  width: 0.34rem;
}
